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Date and Time of the Query: 2019-05-25 T21:03:23 PDT
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For refcode 1999PASP..111...57H:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
1999PASP..111...57H A Test for Large-Scale Systematic Errors in Maps of Galactic Reddening MICHAEL J. HUDSON Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, BC, V8W 3P6, Canada; hudson@uvastro.phys.uvic.ca Received 1998 July 29; accepted 1998 October 8 ABSTRACT. Accurate maps of Galactic reddening are important for a number of applications, such as mapping the peculiar velocity field in the nearby universe. Of particular concern are systematic errors which vary slowly as a function of position on the sky, as these would induce spurious bulk flow. We have compared the reddenings of Burstein & Heiles (BH) and those of Schlegel, Finkbeiner, & Davis (SFD) to independent estimates of the reddening, for Galactic latitudes |b| > 10^deg^. Our primary source of Galactic reddening estimates comes from comparing the difference between the observed B - V colors of early-type galaxies, and the predicted B - V color determined from the B - V-Mg_2_ relation. We have fitted a dipole to the residuals in order to look for large-scale systematic deviations. There is marginal evidence for a dipolar residual in the comparison between the SFD maps and the observed early-type galaxy reddenings. If this is due to an error in the SFD maps, then it can be corrected with a small (13%) multiplicative dipole term. We argue, however, that this difference is more likely to be due to a small (0.01 mag) systematic error in the measured B - V colors of the early-type galaxies. This interpretation is supported by a smaller, independent data set (globular cluster and RR Lyrae stars), which yields a result inconsistent with the early-type galaxy residual dipole. BH reddenings are found to have no significant systematic residuals, apart from the known problem in the region 230^deg^ < l < 310^deg^, -20^deg^ < b < 20^deg^.
Retrieve 311 NED objects in this reference.
Please click here for ADS abstract

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